Preheat the oven to 350F (180C) degrees.
Grease a 9x13 inch baking pan and lightly flour it. Make sure the sides of your baking pan are at least 2 inches tall; otherwise, the cake may overflow.
In a large mixing bowl, combine all-purpose flour, cinnamon, ginger, nutmeg, cloves, baking soda, baking powder, and salt thoroughly using a whisk or spatula.
In another bowl, beat together melted butter with both brown sugar and granulated sugar until creamy and well combined.
Add in whisked eggs one at a time along with vanilla extract and sour cream into the butter-sugar mixture until fully blended before incorporating canned pumpkin.
Gradually fold in dry ingredients into the wet mixture until no streaks remain; be careful not to overmix.
Pour batter into your prepared pan evenly spreading it out before placing it in the oven for about forty minutes or until golden brown on top; let cool before serving warm or at room temperature!